Box spring accessory



FIG. 1 is a front-right side perspective view of a box spring accessory showing my new design;

FIG. 2 is a front view of the box spring accessory of FIG. 1;

FIG. 3 is a back view of the box spring accessory of FIG. 1;

FIG. 4 is a right side view of the box spring accessory of FIG. 1;

FIG. 5 is a left side view of the box spring accessory of FIG. 1;

FIG. 6 is a top view of the box spring accessory of FIG. 1;

FIG. 7 is a bottom view of the box spring accessory of FIG. 1;

FIG. 8 is a flat, unattached view of the box spring accessory of FIG. 1; and,

FIG. 9 is a front-right side perspective view of the box spring accessory of FIG. 1.

The broken lines in the figures are shown for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a box spring accessory, as shown and described. 